Rainbow Electronics FARGO MAESTRO 100 (with TCP_IP) - Manual (Page 450)

Short message Commands
New Message Acknowledgement +CNMA
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WM_DEV_OAT_UGD_049 - 001 VOLUME 3 August 23, 2007
Example of acknowledgement of a new message in PDU mode:
Command Responses
AT+CSMS=1
Note: SMS AT commands compatible with GSM
07.05 Phase 2 + version
OK
AT+CMGF=0
Note: Set PDU mode
OK
Note: PDU mode valid
AT+CNMI=2,2,0,0,0
Note: <mt>=2
OK
+CMT:
,2907913366003000F1240B913366920547
F30000003003419404800B506215D42ECFE
7E17319
Note: Message received
AT+CNMA=2,2<CR>>00D3 <Ctrl-Z>
Note: Negative ACK to the SMS. Reason is:
memory capacity exceeded
OK